JP6815751B2 - Vehicle lighting - Google Patents

Description

The present invention relates to a vehicle lamp, and more specifically, light emitted from a light source is alternately reflected between a half mirror and a reflector, and a part of the light is transmitted to the outside through the half mirror. Regarding vehicle lighting equipment.

Conventionally, as a lamp of this type, there is one disclosed in Patent Document 1 under the name of "vehicle indicator lamp".

In the disclosed vehicle indicator light 80, as shown in FIG. 7, a horn-shaped curved portion 83 of the lamp body 82 is arranged diagonally above the LED light source 81, and an inner lens 84 is arranged so as to face the curved portion 83. The curved portion 83 is provided with a reflecting surface 85 on the surface facing the inner lens 84, and the inner lens 84 is provided with a half mirror surface 86 on the surface facing the curved portion 83.

As a result, the light emitted from the LED light source 81 and reaching the half mirror surface 86 of the inner lens 84 is reflected by the half mirror surface 86 toward the reflecting surface 85 side of the curved portion 83 of the lamp body 82, and the reflected light is reflected. The reflecting surface 85 reflects the light toward the half mirror surface 86, and the reflected light is reflected by the half mirror surface 86 toward the reflecting surface 85 side.

In this way, the light emitted from the LED light source 81 reaches the half mirror surface 86 while being alternately reflected between the reflection surface 85 of the lamp body 82 and the half mirror surface 86 of the inner lens 84. A part of the light passes through the inner lens 84 including the half mirror surface 86 and is emitted to the outside, and the remaining light is reflected toward the reflecting surface 85. As a result, a plurality of ring-shaped light emitting lines are formed concentrically around the LED light source 81 from the light emitting surface of the inner lens 84.

Japanese Patent Application No. 2006-66130

By the way, in the vehicle indicator light 80 having the above configuration, the plurality of ring-shaped light emitting lines formed on the light emitting surface of the inner lens 84 become darker as they move away from the LED light source 81, and the visibility deteriorates. Further, an image (real image) by direct light emitted from the LED light source 81 and directly transmitted through the inner lens 84 and emitted to the outside, and an inner lens including a half mirror surface 86 reflected by the reflection surface 85 of the lamp body 82. There is a large difference in brightness between the image (virtual image) due to the reflected light transmitted through the 84 and emitted to the outside, and the appearance at night is not good.

Therefore, the present invention was devised in view of the above problems, and an object of the present invention is that a part of the light emitted from the light source is reflected alternately between the half mirror and the reflector, and a part of the half mirror is used. In the vehicle lighting fixtures that are transmitted to the outside through the light source, the brightness of multiple emission patterns that are transmitted to the outside through the half mirror is made uniform, and the vehicle lighting fixtures that look good when lit at night are provided. It is to be realized.

In order to solve the above problems, the invention according to claim 1 of the present invention includes a plurality of LED light sources arranged in a row in a first direction and a lens cut surface extending in the first direction. An inner lens that has a side projecting from the lens cut surface and is arranged so as to cover the plurality of LED light sources, and a quadratic curved surface that is joined to the side of the inner lens. A reflector projecting from the side of the inner lens and a half mirror having a half mirror surface and covering the inner lens and the reflector are provided, and the reflector faces the half mirror. The lens cut surface has a reflecting surface on the side surface, the lens cut surface has a predetermined number of lens cuts extending along the first direction, and the light emitted from the plurality of LED light sources is the half mirror. When viewed from the front, at least after passing through the inner lens, the first light that is transmitted through the half mirror surface without being reflected and is emitted to the outside along the first direction. After being refracted by the lens cut surface, it is once reflected by the half mirror, further reflected by the reflecting surface, and again incident on the half mirror, which is parallel to the first direction and the predetermined number of second lights. The lens cut surface includes light, and the lens cut surface passes light emitted from the LED light source so that the second light is incident on the half mirror in a state where the second light is more focused than the first light. In a controlled cross-sectional shape orthogonal to the first direction of each of the predetermined number of lens cuts, the inclination angle of the lens cut with respect to the plane direction of the lens cut surface becomes smaller as it approaches the reflector. Is to be.

Further, according to the second aspect of the present invention, in the first aspect, the reflector has a quadric surface shape extending while being curved toward the half mirror side in a direction away from the inner lens. It is characterized by being present.

Further, in the invention described in claim 3 of the present invention, in either claim 1 or 2, the lens cut surface is formed on the surface side of the inner lens facing the LED light source. It is characterized in that the cross-sectional shape orthogonal to the first direction has a triangular shape.

Further, The invention described in claim 4 of the present invention, in any one of claims 1 to 3, wherein the half mirror, the LED according to the direct light from the LED light source from a position closest to the inner lens It is characterized in that a real image of the light source is formed, and a virtual image of the LED light source is formed by the reflected light of the reflecting surface from other positions.

According to the present invention, the light emitted from the LED light source group and whose optical path is controlled in a condensed manner by the inner lens is half while being repeatedly reflected between the reflecting surface of the reflector facing each other and the half mirror surface of the half mirror. The optical system was configured so that a part of the light would pass through the half mirror and be emitted to the outside each time it was incident on the mirror surface.

As a result, the brightness of a plurality of emission patterns emitted from the half mirror to the outside can be made uniform, and a vehicle lamp having a good appearance when lit at night can be realized.

It is a front view of the lighting fixture for a vehicle of an embodiment. FIG. 1 is a sectional view taken along the line AA of FIG. It is BB sectional view of FIG. It is a ray diagram of the lighting fixture for a vehicle of an embodiment. It is a partial enlarged view of the vicinity of a lens part of an inner lens. It is a front view at the time of lighting of the vehicle lamp of an embodiment. It is explanatory drawing of the prior art.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 6 (the same parts are designated by the same reference numerals). Since the embodiments described below are suitable specific examples of the present invention, various technically preferable limitations are added, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

1 is a front view of the vehicle lamp of the embodiment, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG.

The vehicle lighting fixture (hereinafter, abbreviated as “lighting fixture”) 1 of the present invention is arranged to face each other with the LED light source 2 and the inner lens 10 that controls the light path emitted from the LED light source 2 and directs the light in a predetermined direction. It is provided with a reflector 20 and a half mirror 30 that repeatedly reflect the light emitted from the inner lens 10 and emit a part of the light in the middle thereof, and a housing 40 that surrounds the sides thereof.

A plurality of LED light sources 2 are linearly arranged and mounted on the substrate 4 at predetermined intervals to form an LED light source group 3, and are arranged along one wall in the housing 40 along the wall.

Similar to the LED light source group 3, the inner lens 10 is arranged near one wall in the housing 40 so as to cover the LED light source group 3 along the wall, and is above the LED light source group 3 (light emission direction). Has a lens portion 11 extending along the arrangement direction of the LED light source group 3. The lens unit 11 has a lens cut surface 12 in which an appropriate lens cut is applied to a surface (inner surface) on the side facing the LED light source group 3.

The reflector 20 is located on the side of the inner lens 10 and has a quadric curved surface extending upward from the vicinity of the inner lens 10 toward the other wall on the opposite side with a width of approximately the length of the lens portion 11. Is presenting. Further, above the inner lens 10 (lens portion 11 of the inner lens 10) and the reflector 20, a flat half mirror 30 is arranged so as to cover the inner lens 10 (lens portion 11 of the inner lens 10) and the reflector 20. Has been done.

A reflection surface (specular reflection surface) 21 is formed on the surface (upper surface) of the reflector 20 facing the half mirror 30, and the surface (lower surface) of the half mirror 30 facing the reflector 20 is formed. A half mirror surface (transmission reflection surface) 31 is formed. The reflecting surface 21 of the reflector 20 and the half mirror surface 31 of the half mirror 30 are arranged so that the distance between them gradually decreases as the distance from the lens portion 11 of the inner lens 10 increases.

Therefore (see FIG. 4 (light ray diagram)), the light emitted radially from each LED light source 2 constituting the LED light source group 3 and directed to the lens cut surface 12 of the lens portion 11 of the inner lens 10 is the lens cut surface 12. The light path is controlled so as to condense light and face the extending side of the reflector 20, the light enters the lens portion 11, passes through the lens portion 11, and is emitted toward the half mirror surface 31 of the half mirror 30. ..

The light emitted from the lens unit 11 is focused and incident on the half mirror surface 31 of the half mirror 30 at an appropriate angle of incidence at the position of P1 from an oblique direction, and a part of the incident light enters the half mirror surface 31. The first light is emitted with a width of D1 toward the outside through the inside of the including half mirror 30. The emitted light at this time is light emitted from the LED light source 2 and transmitted through the half mirror 30 including the lens portion 11 of the inner lens 10 and the half mirror surface 31, and does not include reflection. Therefore, a real image is formed by the direct light from the LED light source 2.

On the other hand, the other part of the incident light incident on the position P1 of the half mirror surface 31 of the half mirror 30 is the first time toward the reflection surface 21 of the reflector 20 at the emission angle of the same angle as the incident angle by the half mirror surface 31. Is reflected, and the reflected light is condensed and incident on the position of R1 on the reflecting surface 21 from an oblique direction.

The light incident on the position R1 of the reflecting surface 21 from an oblique direction is first reflected by the reflecting surface 21 toward the half mirror surface 31 of the half mirror 30 at an emission angle of the same angle as the incident angle, and the reflected light is reflected. Is focused and incident on the position of P2 on the half mirror surface 31 from an oblique direction.

Similar to the first emission and reflection, the light incident on the position P2 at a distance S1 from the position P1 of the half mirror surface 31 where the first emission and reflection was performed partially includes the half mirror surface 31. Light is emitted (second time) with the width of D2 to the outside through the inside of the half mirror 30, and the other part is reflected toward the reflecting surface 21 (second time surface), and the reflection thereof is performed. While the light is condensed, it is incident on the position of R2 of the reflecting surface 21 from an oblique direction.

Light incident on the position R2 at a predetermined distance from the position R1 of the reflection surface 21 on which the first reflection is performed from an oblique direction is the same angle as the incident angle by the reflection surface 21 as in the first reflection. The second reflection is performed toward the half mirror surface 31 of the half mirror 30 at the emission angle of, and the reflected light is collected from the position P2 of the half mirror surface 31 where the second emission and reflection are performed. It is incident from an oblique direction at the position of P3 where the interval S2 is placed.

In this way, while repeating reflection between the half mirror surface 31 of the half mirror 30 and the reflecting surface 21 of the reflector 20, a part of the light incident on the half mirror surface 31 on the way is partially reflected on the half mirror surface 31. It is emitted to the outside through the half mirror 30 including.

At this time, the light emitted from the half mirror 30 is light that repeatedly reflects while condensing between the half mirror surface 31 and the reflecting surface 21, so that the degree of condensing increases as the distance from the LED light source 2 increases and the width increases. D1, D2, ..., D (n-1), D (n) gradually decrease. That is, the relationship is D (n-1)> D (n).

Further, by complementing the light beam that gradually decreases as the distance from the LED light source 2 increases with the degree of light collection that gradually increases as the distance from the LED light source 2 increases, even light emitted from a position far from the LED light source 2 is emitted from the LED light source 2. It is possible to secure a light velocity density almost equal to that of light emitted from a close position.

That is, the light emitted from the plurality of positions of the half mirror 30 at predetermined intervals has a width that becomes smaller as the distance from the LED light source 2 increases, but the brightness is almost the same.

The light emitted to the outside through the half mirror 30 after being reflected by the reflecting surface 21 of the reflector 20 is the light emitted from the LED light source 2 guided by the reflection, and thus is guided from the half mirror 30. The second and subsequent emitted lights form a virtual image due to the indirect light (reflected light) from the LED light source 2.

Next, the lens cut surface 12 of the lens portion 11 of the inner lens 10 will be described with reference to FIG. 5 (partially enlarged view in the vicinity of the lens portion).

As described above, the lens cut surface 12 of the lens portion 11 of the inner lens 10 condenses the light emitted radially from each of the LED light sources 2 constituting the LED light source group 3 and faces the extending side of the reflector 20. It has a function to control the optical path. At the same time, the light that repeatedly reflects while condensing between the half mirror surface 31 of the half mirror 30 and the reflecting surface 21 (not shown) of the reflector 20 is emitted at least from the light source of the half mirror surface 31. It is necessary to control the optical path so that the degree of focusing does not have a focusing point by the time the position is reached.

For example, it is also possible to control the optical path so that the focusing point is located at the emission position farthest from the light source on the half mirror surface 31. As a result, the efficiency of light utilization can be maximized.

Therefore, the lens cut surface 12 has a cross-sectional shape perpendicular to the arrangement direction of the LED light source group 3 so that the inclination angle θ of the lens portion 11 with respect to the plane direction gradually decreases as the cross-sectional shape approaches the reflector 20. Has a set lens cut. In FIG. 5, the inclination angles θ1, θ2, and θ3 of the representative values 12a, 12b, and 12c of the lens cut have a relationship of θ1 <θ2 <θ3, respectively.

Specifically, for example, in the present embodiment (see FIG. 4) in which the half mirror 30 has four emission positions, the position is tilted by about 15 ° on the reflector 20 side from the optical axis direction of the LED light source 2. A lens cut 12a has an inclination angle θ1 of the lens unit 11 with respect to the plane direction of about 15 °, and a lens cut 12b located on the optical axis of the LED light source 2 has an inclination angle θ2 of the lens unit 11 with respect to the plane direction of about 15 °. The lens cut 12c at a position of 45 ° and tilted by about 15 ° on the side opposite to the reflector 20 from the optical axis direction of the LED light source 2 has an inclination angle θ3 of the lens portion 11 with respect to the plane direction of about 60 °.

In this case, the reflector 20 extends upward from the vicinity of the inner lens 10 with a radius of 450 mm while being curved, and the half mirror 30 extends while tilting in a direction away from the reflector 20 at an angle of 2 °.

That is, the distance from the LED light source 2 to the lens cut surface 12 of the lens portion 11 of the inner lens 10, the distance between the half mirror surface 31 of the half mirror 30 and the reflecting surface 21 of the reflector 20, the emission interval from the half mirror 30 and the emission. A desired optical system can be obtained by optimizing the inclination angles θ1 to θn of the lens cuts 12a to 12n of the lens cut surface 12 based on the requirements (parameters) such as the number of times.

FIG. 6 is a front view of the lamp 1 when the LED light source group 3 is lit.

A linear light L1 extending linearly with a width D1 along the arrangement direction of the LED light source group 3 is emitted at a position directly above the LED light source group 3, and is separated from the linear light L1 by the distance S1 (pitch S1). In parallel with the linear light L1, a linear light L2 extending linearly with a width D2 narrower than the width D1 of the linear light L1 is emitted, and a position separated from the linear light L2 by the distance S2 (pitch S2). A linear light L3 extending linearly with a width D3 narrower than the width D2 of the linear light L2 is emitted parallel to the linear light L2, and is separated from the linear light L3 by the distance S3 (pitch S3). A linear light L4 extending linearly with a width D4 narrower than the width D3 of the linear light L3 is emitted parallel to the linear light L3, and is separated from the linear light L4 by the distance S4 (pitch S4). In parallel with the linear light L4, the linear light L5 extending linearly with a width D5 narrower than the width D4 of the linear light L4 is emitted.

In this way, the real image of the LED light source 2 constituting the LED light source group 3 is linearly emitted from the lamp 1 from above the LED light source group 3, and a plurality of imaginary images whose width gradually narrows as the distance from the real image increases are real images. It is emitted in a straight line parallel to.

At this time, the one linear real image light and the plurality of linear virtual image lights emitted from the lamp 1 have substantially the same brightness (brightness) as each other, although the widths of the linear light are different from each other. .. Therefore, it is possible to realize a lamp that looks good at night and has excellent commercial value.

1 ... Vehicle lighting 2 ... LED light source 3 ... LED light source group 4 ... Substrate 10 ... Inner lens 11 ... Lens part 12 ... Lens cut surface 12a ... Lens cut 12b ... Lens cut 12c ... Lens cut 20 ... Reflector 21 ... Reflector surface ( Mirror reflection surface)
30 ... Half mirror 31 ... Half mirror surface (transmission reflection surface)
40 ... Housing

Claims (4)

Multiple LED light sources lined up in a row in the first direction,
An inner lens having a lens cut surface extending in the first direction and a side projecting from the lens cut surface and arranged so as to cover the plurality of LED light sources.
A reflector that is joined to the side of the inner lens and is projected from the side of the inner lens so as to have a quadric surface shape.
A half mirror having a half mirror surface and covering the inner lens and the reflector,
With
The reflector has a reflecting surface on a surface facing the half mirror.
The lens cut surface has a predetermined number of lens cuts extending along the first direction.
The light emitted from the plurality of LED light sources is when viewed from the front of the half mirror.
At least, after passing through the inner lens, the first light that is transmitted through the half mirror surface without being reflected and is emitted to the outside along the first direction.
After being refracted by the lens cut surface, it is once reflected by the half mirror, further reflected by the reflecting surface, and again incident on the half mirror, the predetermined number of second lights parallel to the first direction. And, including
The lens cut surface controls the optical path of the light emitted from the LED light source so that the second light is incident on the half mirror in a state where the second light is more focused than the first light.
A vehicle characterized in that, in a cross-sectional shape orthogonal to the first direction of each of the predetermined number of lens cuts, the inclination angle of the lens cut with respect to the plane direction of the lens cut surface becomes smaller as it approaches the reflector. Lighting equipment. The vehicle lamp according to claim 1, wherein the reflector has a quadric curved surface that extends while being curved toward the half mirror side in a direction away from the inner lens. Claim 1 or claim 2 is characterized in that the lens cut surface is formed on the surface side of the inner lens facing the LED light source, and the cross-sectional shape orthogonal to the first direction is triangular. The vehicle lighting equipment described in any of. The real image of the LED light source is formed by the direct light from the LED light source from the position closest to the inner lens of the half mirror, and the virtual image of the LED light source is formed by the reflected light of the reflecting surface from other positions. The vehicle lighting device according to any one of claims 1 to 3, wherein the lighting device is characterized.